drbd Linux教学课件.ppt

RHEL Clustering Storage Management DRBD Distributed Replicated Block Device sync heartbeat-ldirectord 生成规则 健康状态检查 corosync + ldirectord keepalived + ipvs Server: rsync + inotify Client: rsync, sersync nfs c/nfs s nfs c/nfs s 同步 master/slave failover active/active GFS, OCFS2, DLM Master/slave DRBD Distributed Replicated Block Device A software-based, shared-nothing, replicated storage solution mirroring the content of block devices (hard disks, partitions, logical volumes etc.) between servers DRBDs core functionality is implemented by way of a Linux kernel module DRBD mirrors data In real time Transparently Synchronously or asynchronously DRBDs position within the Linux I/O stack MySQL primary secondary secondary/secondary primary/secondary dual primary master/master cluster filesystem: GFS2, OCFS2 HA: ra dlm master/slave User space administration tools drbdadm The high-level administration tool of the DRBD program suite It obtains all DRBD configuration parameters from the configuration file /etc/drbd.conf(/etc/drbd.d/) drbdsetup The program that allows users to configure the DRBD module that has been loaded into the running kernel It is the low-level tool within the DRBD program suite drbdmeta The program which allows users to create, dump, restore, and modify DRBDs meta data structures Resources the collective term that refers to all aspects of a particular replicated storage device Include Resource name This can be any arbitrary, US-ASCII name not containing whitespace by which the resource is referred to DRBD device This is the virtual block device managed by DRBD It has a device major number of 147, and its minor numbers are numbered from 0 onwards, as is customary The associated block device is always named /dev/drbdn, where n is the device minor number Disk configuration This entails the local copy of the data, and meta data for DRBDs internal use Network configuration This entails all aspects of DRBDs communication with the peer node Resour